Water-cooled furnace wall



March 11, 1930. o. NYGAARD I lW1\.TER COOLEDFURNAE YQALL Filed Nov. 28,' 192e man . w 1 1A Eil ATTOR Y Patented Mar. 11, 'i930 UNITED. STATES* PATENT OFFICE escautarsenaal), or sAUGUs, MASSACHUSETTS WATER-0001.131) FURNAGE WALL Application lled November 28, 1928. Serial No. 322,468.

This-invention relates to water cooled furnace walls.

In co-pending applications 1 have disclosed various constructions offurnace walls 5 ha'ving tubes associated with them to conduct a fluid medium which serves -to carry heat away f rom the wall and thereby to reduce the temperature of the wall.` lSuch walls are commonly referred to as water cooled walls even though some other fluid medium is circulated through the tubes.

The present invention aims' particularly to improve the means'for holding thevtubes and refractory blocks composing such a wall in cooperative relationship to each other. In certain of these walls-it is desirable to have the tubes carry the bricks which make up the wall or certain parts of it, and the, invention provides an exceptionally satisfactory con- 2'0 struction for this purpose. i The nature of the invention will be readily understood from the following description when read in connectionwith the accomA panying drawings, and the novelffeaturesi ze will be particularly pointed out in the appended claims. j .-L

In the drawings, 1

Fi vre 1 is a irontv elevation of a part of the urnac wall constructed inv accordance with this invention; I Fig. 2 is a side elevation of the section of wall shown in Fig. 1;

Fig. 3 is a horizontal sectional v'iew on the line 3 3, Fig. 1; and

.35 Fig. 4 isa perspective view of one of the blocks used inthe wall shown in the other figures.

The drawings show the invention'applied vto a wall of the type shown and described in my pending .application Serial No,4 286,128

although it should be understood-thatfthis disclosure ismade rather by way of' illustra-- tion than limitation and that .the invention y can lbe used in a great variety of other. wall constructions. The wall illustrated vcomprises a series of tubes 2'designed to conduct water, steam, or vother fluid. When this wall -is used in a boiler furnace thetubes some` timesare connected into the circulating system of the boiler, and-.vin-other installations feed water is 'circulated through the tubes.

Closely associated vwith these tubes are` i bricks 3, each of these bricks including a p'ortion which lies infront of the tubes, andv another 'Irt that projects rearwardly vbetween the tu s and partly encircles one. of the tubes. Considering any pair of tubes, as for-.

example, the two right-hand-tubes shown lin Fig. l, it will be observed that each of the bricks 3 has a-tapered projection a extending laterally therefrom and fitting into a recess formed in or between the next two' laterally adjacent bricks. Also, that the upper and lower surfaces of each projection leach tube rest end to end; one on the other in` a vertical series, and the two series oii'- bricks in contact with adjacent tubes have their inclined surfaces bearing on each other,

these surfaces t'ending to cause the bricks to gravitate one on the other into contact with their respective tubes. For a morecomplete description of the construction of this Wall reference should be made to the pending'ap- 'plication above'identiied.

In many installations it is desirable to have the tubes support the bricks, and the Ypresent invention provides a clamp construction which is particularly usefulfor this purpose'. As shown, this' clamp comprises an angle bar or channel bar, the latter preferaf l a are inclined. The bricksin contact with bly being used,.to which a series of the tubes 2 is secured. )This channel bar is shown in the drawings at 4. It is located transversely -to and immediately. behind the tubes 2. A'

U-bolt 5 partly encircles veach tube, and its 'sis legs project through holes in the channel ba'r` 4f.' Interposed betweeneach tube 2 and the These blocks approximately fill the space in -the channel bar between the respective tubes 2 and the upright web of the bar, as clearly shown in the drawings. IVhcn the nuts of the bolts are tightenedthe tubes are secured rigidly to the bar and each block 6 is clam ed firmly between the web of the bar andp its respective tube. The blocks or bricks which compose the front section or facing of the wall are herein called bricks for convemence, regardless of the material of which they are made, and the elements G' are referred to as blocks.

The bar 4 eii'ectually resists longitudinal bending because of its flanged construction but the tightening of the nuts on the U-bolts tends to buckle this bar. Such a tendency, however, is eectually resisted by the blocks '6 which bear against the tubes and also i bricks,'therefore, is supported by its contact with one ofthe bolts 5, and these bolts are clamped rigidly to the tubes by the construction above described. Those bricks which rest on the bricks mounted directly on the U-bolts are supported-by the latter bricks. A suicient number of these clamps is used so that no one of them is obliged to carry an excessive weight. For example, the'lowermost right-hand Ubolt shown in vFig. 1 directl supports the half brick 3 and throug it supports thefour bricks' which are located in line with and above it. The brick 3 rests on and is supported by the U- bolt 5, and it ma carr also the wei ht of several bricks above the ick 3. Due to the peculiar construction of the bricks and to the wa in which their inclined surfaces act on eac other, each U-bolt cannot be said to support solely the weight of a series of bricks in contact with the particular tube to which it is clamped, although this is approximately the series of tubes, and the bars of the upper set being staggered with reference to those in the lower set. l

It is desirable to `recess the rearward side of each of the blocks 6 as shown, for example,

at d in Figs. 3 and 4, thisI recess preferably being provided in the `region between the holes c for the U-bolts so that the contact area between the blocks and the channel bars will be reduced and the. rate of conduction of heat from the tubes to the channel bars will be correspondingly lessened.

This construction has the advantage of being economical to manufacture, convenient to install, and readily adaptable to the variations encountered inl-installingwalls of this type. rIfhe channel bars and U-bolts are standard products, and while the blocks 6 must be made specially, their manufacture requires merely a simple casting operation. The construction provides a` very rigid and dependable support for the refractory bricks which protect the tubes and give stron th and rigidity to the entire wall structure ecause of the' fact'that it clamps the tubes rigidly together and holds them in properly spaced relationship to each other.

A further advantage of this construction is that the channel bar forms a convenient anchorage for the bolts which hold the rear panel (not shown) ot the wall in position. That is, a considerable thickness of heat insulating material usually is placed immediately behind the tubes and this material is held in position by a shell or panel which must be anchored in some way to the other parts of the wall structure. The channel bars forma convenient support into which'to thread the bolts that hold the shell in position.

While I have herein shown and described atypical embodiment of my invention, it will be understood thatthe invention may be embodied in other forms without departing from the spirit or scope thereof. v

Having lthus described my invention, what I desire to claim as new is:

` 1 In a water cooled furnace wall, the combination of av series of tubeslocated side by side; bricks positioned in protective relationship to said tubes; and means for supporting said bricks in cooperative relationship to said tubes; said means comprising a flanged bar extending transversely to4 said tubes and located immediately beside-them, blocks fitting ,between the respective tubes and said bar, and devices bearing against the sides of the tubesmemote from said bar and provided with screw'threaded parts cooperating with thebar to secure the tubes to the bar and to clamp said blocksbetween the vrespective tubes and the bar.

2. In a water cooled furnace wall, the combination of a series of tubes located side by side; bricks positioned in protective relation..

i ship to said tubes; and means for supportingk iguanas il to said tubes; and means for supporting said bricks in cooperative relationship to said tubes; said means comprising a flanged bar vextending transversely to said tubes and located immediately beside thein, blocks fitting f between the respective tubes and said bar and having curved faces to bear against the reupective tubes, and devices bearing against the sides of the tubes remote from' said bar and provided With screw threaded parts co operating with the bar to secure the tubes rigidly to the bar and to clamp the blocks betvveen the respective tubes and the bar.

d* a Water cooled furnace Wall, the .coinbinat. of i a Aseries of tubes located side by side; bricks positioned in protective relationi said bricks in cooperative relationship to said tubes; said means comprising a iianged bar extending transversely to said tubes and located immediately beside theni, blocks fittingA between the respective tubes and said bar and having curved `faces to bear'against the re .ispettive tubes, and devices bearing against the sides oftlietubes" reinotefroin said bai' and provided With screvvv threaded parts projecting through said vbaraiid blocks, said devices seivingto secure the tubes to the bar and to clamp said bloeksbetvveen the respec'- tive tunes and the bar.

L if 1, -Water cooled furnace Wall, the conibinatio of aseries o f tubes located side 4by side; b'rmc'lts positioned in protective relationship to said tubes; and means for supporting said br" hs in cooperative relationshipto said tubes; d'ineans comprising a ia-nged' bar extendnig transversely to tubes and lo` cated immediately beside them, blocks fitting l betvveeii the respective tubes and said bai" and' titl having curved faces tobear against the respective tubes, and lllfbcltspartly encircling the respectivev tubes and 'projecting vthrough.

Y the bar, said ll-bclts serving to, secure the tubes tothe bar land to clainp said bloclis between tlie respective tubes and the baru them, blocks tting between the and sai l tubes, Ll-bolts engaging said, tubes and proa jecting through said bar and serving'to se cure the tubes to the bar-and te clamp the s blocks between the lrespective tubes and the bar, andbricks located in protective're-lation to saidl tubes and supported on said bolts, l

7. In a Water cooled furnace Wall, the coni bination of a series of tubes located side by side, a flanged bar extending transversely to Vsaid tubes and located 'immediately beside them, blocks resting in the flange part of the porting said bricks in cooperative relationn ship to said tubes; said means comprising a bar extending, transversely to said4 tubes and located immediately besidethein, blocks tl ting 'between the respective tubes-and said bar and having curved faces yto bear against the respective tubes, and bolts bearing against v the sides ofthe tubes remote from said bar and providedvvith screw threaded parts co operating vvith the bar to secure the tubes idly to the bar and to clamp the-blocks beu tween the respectiveA tubes and the bar.

OSCAR NYGAARD.

5 lin Water cooled furnace wall, the comf1 -v bination cfa series of tubes located side by side; bricks positioned in protective relationship to said tubes; and means for supporting z f said bricks in cooperative relationship to sai tubes; said nieans comprising a flanged bar entendi-rig transversely to said tubes. and located iininediately beside them, bloolts fitting betvveen the respective tubes and saidbar,

and screvvl threaded devices engaging Vthe faces of said tubes remote from the bar but vpurojectiiig through the 'bar and serving to i secure said tubes to the bar and to clamp said blocks between the respective tubes and the bar, Vsaid blocks being .shaped to provide a.4

relatively sinall area of contact With the bar.

6. lln a Water cooled furnace vrall, the coinf bination of a series of tubes'located sideby side, a fdanged barv extending transversely to said tubes and located immediately beside 

